Russian officials say drones have hit three separate regions, injuring five people.

Authorities in the western region of Kursk, which borders Ukraine, said on Sunday that a drone struck a railway station in the region's central city of Kursk, damaging the roof and outer wall.

They said fragments of glass injured five of the 50 passengers and other people who were there at the time.

Russia's defense ministry said on Sunday that it had spotted a drone flying south of Moscow toward the capital, and jammed the vehicle to make it crash. The ministry said it was an attack by Ukraine.

The governor of the southern region of Rostov also said on social media that three drones attacked the region but there were no injuries or damage to buildings.

The Russian defense ministry announced on Saturday that there had been drone attacks outside Moscow and in an area near the border with Ukraine.

The British defense ministry said in the analysis it released on Sunday that "Strikes deep inside Russia are strategically important because President Putin almost certainly invaded Ukraine on the assumption that it would have little direct effect on Russians."

The ministry said, "The leadership of Russia's Aerospace Forces is highly likely under intense pressure to improve air defences over western Russia."